condition mean min max ZT0-3 0.805756 0.805756 0.805756 ZT4-7 0.7063155000000001 0.7063155000000001 0.7063155000000001 ZT8-11 1.162405 1.162405 1.162405 ZT12-15 1.97438 1.97438 1.97438 ZT16-19 2.59894 2.59894 2.59894 ZT20-23 1.67648 1.67648 1.67648